SOLUTION: The lenght of a rectangle is twice the width. The perimeter is 84cm more than the width. Make a diagram and find the dimensions.

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Question 174029: The lenght of a rectangle is twice the width. The perimeter is 84cm more than the width. Make a diagram and find the dimensions.
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!

L=2W
P=84cm
then, P=2L%2B2W, working eqn:
84=2%282W%29%2B2W
84=4W%2B2W=6W-------->cross%2884%2914%2Fcross%286%29=cross%286%29W%2Fcross%286%29
highlight%28W=14cm%29
L=2%2A14=highlight%2828cm=L%29
Check via our working eqn:
84cm=2%2A28%2B2%2A14
84=56%2B28
84cm=84cm good
See the diagram ratio 2:1, being Length is twice the Width:

Thank you,
Jojo